Video receiving tuner

Abstract

A video receiving tuner relating to the present invention comprises an input terminal for receiving video reception signals that are digitally modulated, a front-end block for amplifying the video reception signals fed thereto from the input terminal and selecting a signal of one channel as a selection signal from among the amplified video reception signals, a digital demodulation circuit block for demodulating the selection signal into a digital signal, a re-modulation circuit block for modulating a carrier wave having a predetermined frequency by the digital signal so as to produce a re-modulation signal, a transmission circuit block for processing the re-modulation signal fed thereto from the re-modulation circuit and outputting a resultant signal as a radio signal, an antenna for transmitting the radio signal, and a casing for enclosing the front-end block, the digital demodulation circuit block, the re-modulation circuit block, and the transmission circuit block.

1 . A video receiving tuner comprising: 
 an input terminal for receiving video reception signals that are digitally modulated;    a front-end block for amplifying the video reception signals fed thereto from the input terminal and selecting a signal of one channel as a selection signal from among the amplified video reception signals;    a digital demodulation circuit block for demodulating the selection signal into a digital signal;    a re-modulation circuit block for modulating a carrier wave having a predetermined frequency by the digital signal so as to produce a re-modulation signal;    a transmission circuit block for processing the re-modulation signal fed thereto from the re-modulation circuit and outputting a resultant signal as a radio signal;    an antenna for transmitting the radio signal; and    a casing for enclosing the front-end block, the digital demodulation circuit block, the re-modulation circuit block, and the transmission circuit block.    
     
     
         2 . A video receiving tuner comprising: 
 an input terminal for receiving video reception signals that are digitally modulated;    a tuner block connected to the input terminal comprising: 
 a front-end block having an amplification block for amplifying the video reception signals fed thereto from the input terminal and a channel selection block for selecting, in accordance with a channel control signal obtained by demodulating a control signal which is externally given for selecting a desired channel, a signal of one channel as a selection signal from among the amplified video reception signals;  
 a digital demodulation circuit block for demodulating the selection signal into a digital signal;  
 a re-modulation/demodulation circuit block for modulating a carrier wave having a predetermined frequency by the digital signal so as to produce a re-modulation signal, and demodulating the control signal into the channel control signal so as to be fed to the channel selection block; and  
 a transmission/reception circuit block for processing the re-modulation signal fed thereto from the re-modulation circuit, outputting a resultant signal as a radio signal, and outputting the control signal fed thereto to the re-modulation/demodulation circuit block;  
   an antenna for transmitting the radio signal and receiving the control signal; and    a casing for enclosing the tuner block.    
     
     
         3 . A video receiving tuner as claimed in  claim 2 , 
 wherein a plurality of said tuner blocks are enclosed in the casing.    
     
     
         4 . A video receiving tuner as claimed in  claim 3 , 
 wherein a modulation system of the selection signal selected by at least one tuner block is different from a modulation system of the selection signal selected by another tuner block.    
     
     
         5 . A video receiving tuner as claimed in  claim 1 , 
 wherein a modulation system used for producing the re-modulation signal is different from a modulation system used for producing the selection signal.    
     
     
         6 . A video receiving tuner as claimed in  claim 1 , 
 wherein a frequency band of the carrier wave used for the re-modulation signal is a 2.4 GHz frequency band or a 5 GHz frequency band.    
     
     
         7 . A video receiving tuner as claimed in  claim 2 , 
 wherein the digital demodulation circuit block and the re-modulation/demodulation circuit block are formed by a single integrated circuit.    
     
     
         8 . A video receiving tuner as claimed in  claim 2 , 
 wherein a channel of the carrier wave of the predetermined frequency used by the re-modulation/demodulation circuit block to be modulated with the digital signal is associated in advance with the desired channel to be selected by the front-end block.    
     
     
         9 . A video receiving tuner as claimed in  claim 1 , 
 wherein the video receiving tuner further comprises a power supply unit for supplying power thereto, and the power supply unit is housed in the casing.    
     
     
         10 . A video receiving tuner as claimed in  claim 9 , 
 wherein the input terminal is provided on one surface of the casing so that, when said one surface of the casing is brought into contact with a plane surface on which an external antenna terminal for feeding the video reception signals is provided, a good fit between the external antenna terminal and the input terminal is insured so as to maintain said one surface of the casing in contact with the plane surface.    
     
     
         11 . A video receiving tuner as claimed in  claim 10 , 
 wherein holding means is provided for holding the casing on the plane surface while a good fit is maintained between the external antenna terminal and the input terminal.    
     
     
         12 . A video receiving tuner as claimed in  claim 2 , 
 wherein a modulation system used for producing the re-modulation signal is different from a modulation system used for producing the selection signal.    
     
     
         13 . A video receiving tuner as claimed in  claim 2 , 
 wherein a frequency band of the carrier wave used for the re-modulation signal is a 2.4 GHz frequency band or a 5 GHz frequency band.    
     
     
         14 . A video receiving tuner as claimed in  claim 3 , 
 wherein a channel of the carrier wave of the predetermined frequency used by the re-modulation/demodulation circuit block to be modulated with the digital signal is associated in advance with the desired channel to be selected by the front-end block.    
     
     
         15 . A video receiving tuner as claimed in  claim 2   wherein the video receiving tuner further comprises a power supply unit for supplying power thereto, and the power supply unit is housed in the casing.